Valve-seat grinder



Feb. 11, 1930, J. w. RQY 1,747,085

VALVE SEAT @BINDER Filed June 1. 1925 INVENTOR..

l5 doaEPH w, EOY

4 lA TTORNEY.

Patented Feb. 11, 1930 UNITED STATES PATENT OFFICE ,JOSEPH W. ROY, O F DETROIT, MICHIGAN, ASSIGNOR FIFTY-QNE PHILEAS DELAGE, 0F DETROIT, MICHIGAN PER CENT TO VALVE-*SEAT GRINDER Application led Jgune 1,

My invention relates to a new and useful improvement in a -valve seat grinder, adapted particularly for grinding valve seats of automobiles, and the like, and has for its object the provision of a valve seat grinder of this class, which will be simple of structure, economical of manufacture, and highly etilcient in use.

Another object of the invention is the provision of a valve seat grinder of this class, which may be accurately cent-ered relatively to the valve seat and utilized for grinding the entire surface of the valve seat at one time. j

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention Will be best understoo from a reference to the accompanying drawings, which form a part of this specification and in which,

Fig. 1 is a side elevational view of the invention,

Fig. 2 is a longitudinal central vertical sectional view of the invention,

Fig. 3 is an enlarged sectional view taken on substantially line 3 3 of Fig. 2.

In the construction of internal combustion engines, in which valves are adapted for resting upon seats to permit the intake and exhaust of the combustible fuel, the valve is generally provided With a valve stem, which projects through a guide concentrically arranged relatively to the valve seat, so that, When the stem of the valve is projected ,there-V through, the valve will be centered relatively to its seat. In the present invention, the valve stem guide is utilized for guiding the valve seat grinder to the valve seat.

There has been developed a -valvef seat grinder, adapted to be centered to the valve seat by utilizing the valve stem guide. In this device, however, the valve seat is not ground throughout its entire surface at the saine time, and it is necessary to rotate the grinder on an axis centered relatively to the valve seat.. This device has proven very etlicient in grinding valve seats, but the device is not so well adapted fo:` grinding the end 1925. Serial No. 38,887.

valves which are close to an abutment, which i having a sheathing 7 and a flexible shaft 8 a mounted therein, is suitably connected to an electric motor or other source of power. Projecting from the shaft 8 is a tongue 9. The tongue 9 is adapted to project into a bore formed in a reduced end 17 of' the shaft 18, said bore being provided with a rib 16 for engaging'the tongue 9. As shown in Fig. 2,

the sheath 7 is attached to a `coupling 10,

which is secured, by means ofthe gland orpacking sleeve 11, to a .threaded-'neck 12, formed on the plug 13.'- The vplug 13 is threaded into the sleeve 14, Whichserves as a handle for the operator to grasp While using the device. Threaded into one end of the sleeve 14 is a plug 15. The shaft 18 is provided, at its opposite end, With a reduced portion 19, a collar 20 being formed adjacent the portion 19. Embracing the portion 19, in a snug fit, is a ring 21 having a peripheral groove, adapted for the reception of the ball bearings 22, which also engage in a groove in the ring 23, the ring 23 being inserted in the j sleeve 14 in a press fit.

Threaded upon the portion 19 is a nut 24, which is adapted to engage in a recess formed on the inner face of the plug 1 5. A ring 23 is also pressed into the sleeve 14, adjacent the other end,y and adapted to co-operate with the ring 21', which is pressed upon the portion 17, to retain the ballbearings 22 in position. It Will be noted that` the ring 21 abuts against the shoulder formed at the juncture of the portions 17 and ,18, so that these rings 21and 21 serve to prevent longitudinal movement of the shaft 18 in the sleeve 14, a ball bearing being thus provided for reducing the friction uponv the rotation of the shaft 18, and the structure bein also a thrust bearing. Projecting from t e reduced portion 19 and integral therewith,'is a further reduced portion 25, which projects through a disc 33 and through a sleeve 35, positioned in a grinding stone 34, a suitable nut 37 being provided to clamp the disc 33 into close engagement with the face of the grinding stone 34, a washer 36 being positioned between the nut 37 and the lower end of the stone 34. In the drawings, it will be noted that the grinding face of the stone 34 is at an angle to the axis of the shaft 18. In most engines, the valve seat is at a definitely determined angle and the angle of the grinding face of the stone 34 is designed to coincide with the angle of the valve seat, so that, when the shaft 18 is properly centered relatively to the valve seat, the grinding face of the stone, when brought into contact with the valve seat, will grind the valve seat at the proper angle. As shown in Fig. 3, the reduced portion 26 is formed tubular and the ing a reduced portion to accommodate the inwardly projecting end of the screw 31. As shown in Fig. 3, the screw 31 will permit longitudinal movement of thepin 29 in the socket 25 within certain limits. Formed in the pin inserted loosely in said tubular end said guide pin havin at its inserted end a reduced portion; and aIxead mounted on the end of said reduced portion, said head being of greater diameter than said reduced portion; and a pin projected radially inwardly of said shaftA for engaging between said head and the largerI portion of said pin for permitting free rotation of said pin on its axis relatively to said shaft and reventing removal of said pin from said soc et.

2. In a valve seat grinder of theclass described a rotatable shaft having a reduced portion at one end provided with a socket; a

JOSEPH w. ROY.

portion 25 is a slot 32 in which a suitable 'wedge-sha ed tool may be inserted for the purpose o forcing the pin 29 outwardly relatively to the socket 25, to effect a removal of the guide pin 28. The valve stems of the different valves are of different sizes, so that it may be necessary in using the device to remove the pin 28 and replace it with another pin of a dlferent size, the shank of these pins being uniform. Consequently, it is' desirable that some means of removing the pin 28 lbe provided.

In operation, the pin 28 would be inserted into the valve stem guide, and the rotating stone 34 moved downwardly into engagement with the valve seat. This rotating stone 34 would then serveto grind the valve seat uniforml throughout its area at the desired angle, t e operation being an accurate and a quick one.

l scope of the appended claims.

While I have illustrated and described the preferred form of structure, I do not wish to imit myself to the precise form of structure shown but desire to avail myself of such variations and modifications as come within the What I claun 1s: 1. A valve seat grinder of the class described comprising a rotatable shaft; a handhold mounted in embracing relation on said shaft, said shaft beingufree to turn within vsaid handheld; a grin g'` member mounted on one end of said shaft exterior of said handhold, said end being formed Aa., 

